2005-04-17 06:20:36 +08:00
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/*
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* net/sched/sch_prio.c Simple 3-band priority "scheduler".
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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2007-02-09 22:25:16 +08:00
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* Fixes: 19990609: J Hadi Salim <hadi@nortelnetworks.com>:
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2005-04-17 06:20:36 +08:00
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* Init -- EINVAL when opt undefined
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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2007-03-26 14:06:12 +08:00
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#include <net/netlink.h>
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2005-04-17 06:20:36 +08:00
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#include <net/pkt_sched.h>
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struct prio_sched_data
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{
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int bands;
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2007-06-29 12:04:31 +08:00
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int curband; /* for round-robin */
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2005-04-17 06:20:36 +08:00
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struct tcf_proto *filter_list;
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u8 prio2band[TC_PRIO_MAX+1];
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struct Qdisc *queues[TCQ_PRIO_BANDS];
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2007-06-29 12:04:31 +08:00
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int mq;
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2005-04-17 06:20:36 +08:00
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};
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static struct Qdisc *
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prio_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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u32 band = skb->priority;
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struct tcf_result res;
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2007-07-31 08:07:14 +08:00
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int err;
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2005-04-17 06:20:36 +08:00
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2006-01-09 14:35:55 +08:00
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*qerr = NET_XMIT_BYPASS;
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2005-04-17 06:20:36 +08:00
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if (TC_H_MAJ(skb->priority) != sch->handle) {
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2007-07-31 08:07:14 +08:00
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err = tc_classify(skb, q->filter_list, &res);
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2005-04-17 06:20:36 +08:00
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#ifdef CONFIG_NET_CLS_ACT
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2007-08-31 13:35:46 +08:00
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switch (err) {
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2005-04-17 06:20:36 +08:00
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case TC_ACT_STOLEN:
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case TC_ACT_QUEUED:
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*qerr = NET_XMIT_SUCCESS;
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case TC_ACT_SHOT:
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return NULL;
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2007-04-21 08:09:22 +08:00
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}
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2005-04-17 06:20:36 +08:00
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#endif
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2007-07-31 08:07:14 +08:00
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if (!q->filter_list || err < 0) {
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2005-04-17 06:20:36 +08:00
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if (TC_H_MAJ(band))
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band = 0;
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2007-06-29 12:04:31 +08:00
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band = q->prio2band[band&TC_PRIO_MAX];
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goto out;
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2005-04-17 06:20:36 +08:00
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}
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band = res.classid;
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}
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band = TC_H_MIN(band) - 1;
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2007-05-14 17:57:19 +08:00
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if (band >= q->bands)
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2007-06-29 12:04:31 +08:00
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band = q->prio2band[0];
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out:
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if (q->mq)
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skb_set_queue_mapping(skb, band);
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2005-04-17 06:20:36 +08:00
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return q->queues[band];
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}
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static int
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prio_enqueue(struct sk_buff *skb, struct Qdisc *sch)
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{
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struct Qdisc *qdisc;
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int ret;
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qdisc = prio_classify(skb, sch, &ret);
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#ifdef CONFIG_NET_CLS_ACT
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if (qdisc == NULL) {
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2006-01-09 14:35:55 +08:00
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if (ret == NET_XMIT_BYPASS)
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2005-04-17 06:20:36 +08:00
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sch->qstats.drops++;
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kfree_skb(skb);
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return ret;
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}
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#endif
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if ((ret = qdisc->enqueue(skb, qdisc)) == NET_XMIT_SUCCESS) {
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sch->bstats.bytes += skb->len;
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sch->bstats.packets++;
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sch->q.qlen++;
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return NET_XMIT_SUCCESS;
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}
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sch->qstats.drops++;
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2007-02-09 22:25:16 +08:00
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return ret;
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2005-04-17 06:20:36 +08:00
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}
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static int
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prio_requeue(struct sk_buff *skb, struct Qdisc* sch)
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{
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struct Qdisc *qdisc;
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int ret;
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qdisc = prio_classify(skb, sch, &ret);
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#ifdef CONFIG_NET_CLS_ACT
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if (qdisc == NULL) {
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2006-01-09 14:35:55 +08:00
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if (ret == NET_XMIT_BYPASS)
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2005-04-17 06:20:36 +08:00
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sch->qstats.drops++;
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kfree_skb(skb);
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return ret;
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}
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#endif
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if ((ret = qdisc->ops->requeue(skb, qdisc)) == NET_XMIT_SUCCESS) {
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sch->q.qlen++;
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sch->qstats.requeues++;
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return 0;
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}
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sch->qstats.drops++;
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return NET_XMIT_DROP;
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}
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static struct sk_buff *
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prio_dequeue(struct Qdisc* sch)
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{
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struct sk_buff *skb;
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struct prio_sched_data *q = qdisc_priv(sch);
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int prio;
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struct Qdisc *qdisc;
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for (prio = 0; prio < q->bands; prio++) {
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2007-06-29 12:04:31 +08:00
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/* Check if the target subqueue is available before
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* pulling an skb. This way we avoid excessive requeues
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* for slower queues.
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*/
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2007-10-24 11:50:58 +08:00
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if (!__netif_subqueue_stopped(sch->dev, (q->mq ? prio : 0))) {
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2007-06-29 12:04:31 +08:00
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qdisc = q->queues[prio];
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skb = qdisc->dequeue(qdisc);
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if (skb) {
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sch->q.qlen--;
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return skb;
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}
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2005-04-17 06:20:36 +08:00
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}
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}
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return NULL;
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}
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2007-06-29 12:04:31 +08:00
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static struct sk_buff *rr_dequeue(struct Qdisc* sch)
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{
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struct sk_buff *skb;
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struct prio_sched_data *q = qdisc_priv(sch);
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struct Qdisc *qdisc;
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int bandcount;
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/* Only take one pass through the queues. If nothing is available,
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* return nothing.
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*/
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for (bandcount = 0; bandcount < q->bands; bandcount++) {
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/* Check if the target subqueue is available before
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* pulling an skb. This way we avoid excessive requeues
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* for slower queues. If the queue is stopped, try the
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* next queue.
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*/
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2007-10-24 11:50:58 +08:00
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if (!__netif_subqueue_stopped(sch->dev,
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2007-06-29 12:04:31 +08:00
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(q->mq ? q->curband : 0))) {
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qdisc = q->queues[q->curband];
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skb = qdisc->dequeue(qdisc);
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if (skb) {
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sch->q.qlen--;
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q->curband++;
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if (q->curband >= q->bands)
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q->curband = 0;
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return skb;
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}
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}
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q->curband++;
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if (q->curband >= q->bands)
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q->curband = 0;
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}
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return NULL;
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}
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2005-04-17 06:20:36 +08:00
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static unsigned int prio_drop(struct Qdisc* sch)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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int prio;
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unsigned int len;
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struct Qdisc *qdisc;
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for (prio = q->bands-1; prio >= 0; prio--) {
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qdisc = q->queues[prio];
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2006-03-21 11:00:49 +08:00
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if (qdisc->ops->drop && (len = qdisc->ops->drop(qdisc)) != 0) {
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2005-04-17 06:20:36 +08:00
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sch->q.qlen--;
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return len;
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}
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}
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return 0;
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}
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static void
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prio_reset(struct Qdisc* sch)
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{
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int prio;
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struct prio_sched_data *q = qdisc_priv(sch);
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for (prio=0; prio<q->bands; prio++)
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qdisc_reset(q->queues[prio]);
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sch->q.qlen = 0;
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}
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static void
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prio_destroy(struct Qdisc* sch)
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{
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int prio;
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struct prio_sched_data *q = qdisc_priv(sch);
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2007-03-24 02:29:43 +08:00
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tcf_destroy_chain(q->filter_list);
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2005-04-17 06:20:36 +08:00
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for (prio=0; prio<q->bands; prio++)
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qdisc_destroy(q->queues[prio]);
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}
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2008-01-23 14:11:17 +08:00
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static int prio_tune(struct Qdisc *sch, struct nlattr *opt)
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2005-04-17 06:20:36 +08:00
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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2007-06-29 12:04:31 +08:00
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struct tc_prio_qopt *qopt;
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2008-01-23 14:11:17 +08:00
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struct nlattr *tb[TCA_PRIO_MAX + 1];
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2005-04-17 06:20:36 +08:00
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int i;
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2008-01-23 14:11:17 +08:00
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if (nla_parse_nested_compat(tb, TCA_PRIO_MAX, opt, NULL, qopt,
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sizeof(*qopt)))
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2005-04-17 06:20:36 +08:00
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return -EINVAL;
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2007-06-29 12:04:31 +08:00
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q->bands = qopt->bands;
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/* If we're multiqueue, make sure the number of incoming bands
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* matches the number of queues on the device we're associating with.
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* If the number of bands requested is zero, then set q->bands to
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2007-07-31 08:13:45 +08:00
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* dev->egress_subqueue_count. Also, the root qdisc must be the
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* only one that is enabled for multiqueue, since it's the only one
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* that interacts with the underlying device.
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2007-06-29 12:04:31 +08:00
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*/
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2008-01-23 14:11:17 +08:00
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q->mq = nla_get_flag(tb[TCA_PRIO_MQ]);
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2007-06-29 12:04:31 +08:00
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if (q->mq) {
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2007-07-31 08:13:45 +08:00
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if (sch->parent != TC_H_ROOT)
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2007-06-29 12:04:31 +08:00
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return -EINVAL;
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if (netif_is_multiqueue(sch->dev)) {
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if (q->bands == 0)
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q->bands = sch->dev->egress_subqueue_count;
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else if (q->bands != sch->dev->egress_subqueue_count)
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return -EINVAL;
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} else
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return -EOPNOTSUPP;
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}
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if (q->bands > TCQ_PRIO_BANDS || q->bands < 2)
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2005-04-17 06:20:36 +08:00
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return -EINVAL;
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for (i=0; i<=TC_PRIO_MAX; i++) {
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2007-06-29 12:04:31 +08:00
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if (qopt->priomap[i] >= q->bands)
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2005-04-17 06:20:36 +08:00
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return -EINVAL;
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}
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sch_tree_lock(sch);
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memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1);
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for (i=q->bands; i<TCQ_PRIO_BANDS; i++) {
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struct Qdisc *child = xchg(&q->queues[i], &noop_qdisc);
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2006-11-30 09:36:20 +08:00
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if (child != &noop_qdisc) {
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qdisc_tree_decrease_qlen(child, child->q.qlen);
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2005-04-17 06:20:36 +08:00
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qdisc_destroy(child);
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2006-11-30 09:36:20 +08:00
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}
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2005-04-17 06:20:36 +08:00
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}
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sch_tree_unlock(sch);
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2006-01-17 18:24:26 +08:00
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for (i=0; i<q->bands; i++) {
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if (q->queues[i] == &noop_qdisc) {
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2005-04-17 06:20:36 +08:00
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struct Qdisc *child;
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2006-11-30 09:35:18 +08:00
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child = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
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TC_H_MAKE(sch->handle, i + 1));
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2005-04-17 06:20:36 +08:00
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if (child) {
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sch_tree_lock(sch);
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2006-01-17 18:24:26 +08:00
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child = xchg(&q->queues[i], child);
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2005-04-17 06:20:36 +08:00
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2006-11-30 09:36:20 +08:00
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if (child != &noop_qdisc) {
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qdisc_tree_decrease_qlen(child,
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child->q.qlen);
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2005-04-17 06:20:36 +08:00
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qdisc_destroy(child);
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2006-11-30 09:36:20 +08:00
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}
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2005-04-17 06:20:36 +08:00
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sch_tree_unlock(sch);
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}
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}
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}
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return 0;
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}
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2008-01-23 14:11:17 +08:00
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static int prio_init(struct Qdisc *sch, struct nlattr *opt)
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2005-04-17 06:20:36 +08:00
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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int i;
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for (i=0; i<TCQ_PRIO_BANDS; i++)
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q->queues[i] = &noop_qdisc;
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if (opt == NULL) {
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return -EINVAL;
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} else {
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int err;
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if ((err= prio_tune(sch, opt)) != 0)
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return err;
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}
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return 0;
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}
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static int prio_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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struct prio_sched_data *q = qdisc_priv(sch);
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2007-04-20 11:29:13 +08:00
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unsigned char *b = skb_tail_pointer(skb);
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2008-01-23 14:11:17 +08:00
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struct nlattr *nest;
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2005-04-17 06:20:36 +08:00
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|
|
struct tc_prio_qopt opt;
|
|
|
|
|
|
|
|
opt.bands = q->bands;
|
|
|
|
memcpy(&opt.priomap, q->prio2band, TC_PRIO_MAX+1);
|
2007-06-29 12:04:31 +08:00
|
|
|
|
2008-01-23 14:11:17 +08:00
|
|
|
nest = nla_nest_compat_start(skb, TCA_OPTIONS, sizeof(opt), &opt);
|
|
|
|
if (nest == NULL)
|
|
|
|
goto nla_put_failure;
|
|
|
|
if (q->mq) {
|
|
|
|
if (nla_put_flag(skb, TCA_PRIO_MQ) < 0)
|
|
|
|
goto nla_put_failure;
|
|
|
|
}
|
|
|
|
nla_nest_compat_end(skb, nest);
|
2007-06-29 12:04:31 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
return skb->len;
|
|
|
|
|
2008-01-23 14:11:17 +08:00
|
|
|
nla_put_failure:
|
2007-03-26 14:06:12 +08:00
|
|
|
nlmsg_trim(skb, b);
|
2005-04-17 06:20:36 +08:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int prio_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
|
|
|
|
struct Qdisc **old)
|
|
|
|
{
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
unsigned long band = arg - 1;
|
|
|
|
|
|
|
|
if (band >= q->bands)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (new == NULL)
|
|
|
|
new = &noop_qdisc;
|
|
|
|
|
|
|
|
sch_tree_lock(sch);
|
|
|
|
*old = q->queues[band];
|
|
|
|
q->queues[band] = new;
|
2006-11-30 09:36:20 +08:00
|
|
|
qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
|
2005-04-17 06:20:36 +08:00
|
|
|
qdisc_reset(*old);
|
|
|
|
sch_tree_unlock(sch);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct Qdisc *
|
|
|
|
prio_leaf(struct Qdisc *sch, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
unsigned long band = arg - 1;
|
|
|
|
|
|
|
|
if (band >= q->bands)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return q->queues[band];
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned long prio_get(struct Qdisc *sch, u32 classid)
|
|
|
|
{
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
unsigned long band = TC_H_MIN(classid);
|
|
|
|
|
|
|
|
if (band - 1 >= q->bands)
|
|
|
|
return 0;
|
|
|
|
return band;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned long prio_bind(struct Qdisc *sch, unsigned long parent, u32 classid)
|
|
|
|
{
|
|
|
|
return prio_get(sch, classid);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void prio_put(struct Qdisc *q, unsigned long cl)
|
|
|
|
{
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2008-01-23 14:11:17 +08:00
|
|
|
static int prio_change(struct Qdisc *sch, u32 handle, u32 parent, struct nlattr **tca, unsigned long *arg)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
unsigned long cl = *arg;
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
|
|
|
|
if (cl - 1 > q->bands)
|
|
|
|
return -ENOENT;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int prio_delete(struct Qdisc *sch, unsigned long cl)
|
|
|
|
{
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
if (cl - 1 > q->bands)
|
|
|
|
return -ENOENT;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int prio_dump_class(struct Qdisc *sch, unsigned long cl, struct sk_buff *skb,
|
|
|
|
struct tcmsg *tcm)
|
|
|
|
{
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
|
|
|
|
if (cl - 1 > q->bands)
|
|
|
|
return -ENOENT;
|
|
|
|
tcm->tcm_handle |= TC_H_MIN(cl);
|
|
|
|
if (q->queues[cl-1])
|
|
|
|
tcm->tcm_info = q->queues[cl-1]->handle;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-02-01 04:21:24 +08:00
|
|
|
static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
|
|
|
|
struct gnet_dump *d)
|
|
|
|
{
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
struct Qdisc *cl_q;
|
|
|
|
|
|
|
|
cl_q = q->queues[cl - 1];
|
|
|
|
if (gnet_stats_copy_basic(d, &cl_q->bstats) < 0 ||
|
|
|
|
gnet_stats_copy_queue(d, &cl_q->qstats) < 0)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static void prio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
|
|
|
|
{
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
int prio;
|
|
|
|
|
|
|
|
if (arg->stop)
|
|
|
|
return;
|
|
|
|
|
|
|
|
for (prio = 0; prio < q->bands; prio++) {
|
|
|
|
if (arg->count < arg->skip) {
|
|
|
|
arg->count++;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
if (arg->fn(sch, prio+1, arg) < 0) {
|
|
|
|
arg->stop = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
arg->count++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct tcf_proto ** prio_find_tcf(struct Qdisc *sch, unsigned long cl)
|
|
|
|
{
|
|
|
|
struct prio_sched_data *q = qdisc_priv(sch);
|
|
|
|
|
|
|
|
if (cl)
|
|
|
|
return NULL;
|
|
|
|
return &q->filter_list;
|
|
|
|
}
|
|
|
|
|
2007-11-14 17:44:41 +08:00
|
|
|
static const struct Qdisc_class_ops prio_class_ops = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.graft = prio_graft,
|
|
|
|
.leaf = prio_leaf,
|
|
|
|
.get = prio_get,
|
|
|
|
.put = prio_put,
|
|
|
|
.change = prio_change,
|
|
|
|
.delete = prio_delete,
|
|
|
|
.walk = prio_walk,
|
|
|
|
.tcf_chain = prio_find_tcf,
|
|
|
|
.bind_tcf = prio_bind,
|
|
|
|
.unbind_tcf = prio_put,
|
|
|
|
.dump = prio_dump_class,
|
2007-02-01 04:21:24 +08:00
|
|
|
.dump_stats = prio_dump_class_stats,
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
2007-11-14 17:44:41 +08:00
|
|
|
static struct Qdisc_ops prio_qdisc_ops __read_mostly = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.next = NULL,
|
|
|
|
.cl_ops = &prio_class_ops,
|
|
|
|
.id = "prio",
|
|
|
|
.priv_size = sizeof(struct prio_sched_data),
|
|
|
|
.enqueue = prio_enqueue,
|
|
|
|
.dequeue = prio_dequeue,
|
|
|
|
.requeue = prio_requeue,
|
|
|
|
.drop = prio_drop,
|
|
|
|
.init = prio_init,
|
|
|
|
.reset = prio_reset,
|
|
|
|
.destroy = prio_destroy,
|
|
|
|
.change = prio_tune,
|
|
|
|
.dump = prio_dump,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
2007-11-14 17:44:41 +08:00
|
|
|
static struct Qdisc_ops rr_qdisc_ops __read_mostly = {
|
2007-06-29 12:04:31 +08:00
|
|
|
.next = NULL,
|
|
|
|
.cl_ops = &prio_class_ops,
|
|
|
|
.id = "rr",
|
|
|
|
.priv_size = sizeof(struct prio_sched_data),
|
|
|
|
.enqueue = prio_enqueue,
|
|
|
|
.dequeue = rr_dequeue,
|
|
|
|
.requeue = prio_requeue,
|
|
|
|
.drop = prio_drop,
|
|
|
|
.init = prio_init,
|
|
|
|
.reset = prio_reset,
|
|
|
|
.destroy = prio_destroy,
|
|
|
|
.change = prio_tune,
|
|
|
|
.dump = prio_dump,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
};
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static int __init prio_module_init(void)
|
|
|
|
{
|
2007-06-29 12:04:31 +08:00
|
|
|
int err;
|
|
|
|
|
|
|
|
err = register_qdisc(&prio_qdisc_ops);
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
err = register_qdisc(&rr_qdisc_ops);
|
|
|
|
if (err < 0)
|
|
|
|
unregister_qdisc(&prio_qdisc_ops);
|
|
|
|
return err;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2007-02-09 22:25:16 +08:00
|
|
|
static void __exit prio_module_exit(void)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
unregister_qdisc(&prio_qdisc_ops);
|
2007-06-29 12:04:31 +08:00
|
|
|
unregister_qdisc(&rr_qdisc_ops);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(prio_module_init)
|
|
|
|
module_exit(prio_module_exit)
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
2007-06-29 12:04:31 +08:00
|
|
|
MODULE_ALIAS("sch_rr");
|